CN111732322A - Sludge deep dehydration treatment technical method for recycling conditioner - Google Patents

Sludge deep dehydration treatment technical method for recycling conditioner Download PDF

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Publication number
CN111732322A
CN111732322A CN202010661533.XA CN202010661533A CN111732322A CN 111732322 A CN111732322 A CN 111732322A CN 202010661533 A CN202010661533 A CN 202010661533A CN 111732322 A CN111732322 A CN 111732322A
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China
Prior art keywords
sludge
solvent
solid
deep
mud cake
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CN202010661533.XA
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Chinese (zh)
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武博然
戴晓虎
柴晓利
汪浩
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Tongji University
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Tongji University
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Priority to CN202010661533.XA priority Critical patent/CN111732322A/en
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00Treatment of sludge; Devices therefor
    • C02F11/12Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/14Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
    • C02F11/147Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using organic substances

Abstract

The invention provides a sludge deep dehydration treatment technical method for recycling a conditioner, which comprises the following steps: mixing the sludge with a polar volatile organic solvent, stirring and extracting for reaction, and transferring a polar water-holding substance phase in the sludge to an organic phase, so that the solid-liquid separation performance of the sludge is improved; then, solid-liquid separation is carried out in a filter pressing mode, and the solvents in the filtrate and the dewatered mud cake are effectively recovered by reduced pressure distillation and reduced pressure evaporation respectively, so that the recycling of the solvent type sludge dewatering conditioner is completed while the solid content of the mud cake is remarkably improved, and finally the solvent recovery rate is more than 90 percent and the water content of the mud cake is lower than 60 percent. The method reduces the consumption of the sludge dehydration process on the dehydration conditioning agent, also reduces the energy consumption in the sludge heat drying treatment process, and has important social and environmental benefits and wide market application prospect.

Description

Sludge deep dehydration treatment technical method for recycling conditioner
Technical Field
The invention belongs to the technical field of environmental protection, and relates to a sludge deep dehydration treatment technical method for recycling a conditioner.
Background
Sludge is a necessary product of biological sewage treatment, carries a large amount of pathogenic bacteria, heavy metals and toxic organic pollutants, and can cause serious environmental pollution if not properly treated. Since the 90 s of the 20 th century, with the rapid development of economic construction and urbanization level of China, the sewage generation amount is increasing day by day, and correspondingly, the sewage collection and treatment rate is gradually improved, so that a large amount of sludge is generated. Therefore, the sludge produced in large quantity poses a serious challenge to the prevention and treatment of environmental pollution and the sustainable utilization of social resources in China. Because of the limitation of factors such as technology, capital and the like, the safe treatment and disposal of sludge in China is still a weak link in the field of water pollution control, and random stockpiling becomes a main discharge outlet of sludge in sewage plants, so that the secondary pollution caused by the secondary pollution seriously threatens the environmental quality near a sludge stock dump and is contrary to the current social ecological civilization development concept, therefore, the safe, efficient, energy-saving and low-cost sludge treatment and disposal technology is still an inevitable requirement for improving the environmental quality and becomes a mainstream development trend of the water pollution control technology.
Dehydration is the first step of sludge treatment and disposal, and no matter sludge transportation, composting, incineration, solidification, stabilization and landfill are carried out, strict requirements are made on the water content of sludge, for example, the water content of sanitary landfill sludge must be lower than 60 wt.% as specified in sludge quality for mixed landfill of sludge disposal in urban sewage treatment plants (GB/T23485-2009); and it is generally accepted that the upper limit of water content for sludge self-sustaining combustion should be 50 wt.%; for aerobic composting, the water content of the sludge is required to be lower than 60 wt.%, otherwise, the mass transfer of gas in the heap is not facilitated. However, the components of the sludge are extremely complex, the organic matter content usually accounts for 70-80 wt% of the total solid content, and the organic components have high hydrophilicity and water retention, so that the sludge is in a colloidal floc structure, and the dehydration performance is extremely poor, so that how to reduce the water content of the sludge with high efficiency and low consumption is a key link for improving the technical level of sludge treatment in China.
At present, coagulants and flocculants represented by polyaluminium chloride (PAC), polyferric chloride (PFC) and Polyacrylamide (PAM) are still widely used sludge dewatering conditioners, the surface electrical property and the aggregation state of solid particles of sludge are changed through electrical property neutralization and adsorption and bridging effects, the interstitial water content of the sludge can be reduced to a certain extent, the removal of free water of the sludge is promoted, but the removal of surface attached water and bound water has no obvious excellent effectTherefore, after the traditional conditioner is adopted, mechanical dehydration is carried out, and the water content of the sludge can be only reduced to about 80 wt.%. Moreover, incineration gradually becomes the development direction of sludge final treatment in China due to obvious reduction, stabilization and energy benefits of incineration, but the addition of polyaluminium chloride (PAC) and polyferric chloride (PFC) introduces a large amount of chloride ions into sludge, so that the dioxin generation risk in the sludge incineration process is increased, and Fe3+The introduction of the (B) can cause the corrosion of sludge treatment equipment, and the defects seriously limit the sustainable popularization and application of the traditional dehydration conditioner in the deep dehydration and heat drying processes of the sludge. In addition, for the sludge deep dehydration process, quicklime is widely used as a dehydration and solidification agent, but the adding amount of the quicklime generally reaches 10-15 wt% of the wet weight of the sludge, the adding amount is high, the capacity-increasing ratio is large, the pH value of the sludge is adjusted to be alkaline, and the like, which become main factors of the traditional dehydration and solidification agent for restricting the subsequent resource utilization and treatment efficiency of the sludge. Therefore, on the premise of considering effective deep dehydration of the sludge, if the cyclic recycling of the dehydration conditioner can be realized, the method has important significance for improving the technical level of sludge treatment and disposal, and simultaneously has wide market application prospect and good social and environmental benefits.
Disclosure of Invention
Aiming at the defects of the prior art, the invention mainly aims to provide a sludge deep dehydration treatment technical method for recycling a conditioner, and the treatment method has the characteristics of no consumption of a dehydration conditioner, low energy consumption of sludge deep dehydration, simple and easy process flow and the like.
In order to achieve the above purpose, the solution of the invention is as follows:
a sludge deep dehydration treatment technical method for recycling conditioner comprises the following steps:
(1) mixing the sludge and a polar volatile organic solvent, stirring, extracting and reacting for a certain time to transfer polar water-holding substances in the sludge from a solid-liquid phase interface to an organic phase, thereby reducing the water-holding capacity of the sludge and improving the solid-liquid separation performance of the sludge;
(2) performing solid-liquid separation on the sludge in a filter pressing mode;
(3) the effective recovery of the solvent in the filtrate and the dewatered mud cake is realized by respectively utilizing reduced pressure distillation and reduced pressure evaporation, so that the recycling of the solvent type sludge dewatering conditioner is completed while the solid content of the mud cake is remarkably improved.
Preferably, in the step (1), the sludge is excess sludge of a sewage treatment plant.
Preferably, in the step (1), the water content of the sludge is 95-99%.
Preferably, in step (1), the polar volatile organic solvent is acetonitrile, acetone or methanol.
Preferably, in the step (1), the mixing mass ratio of the polar volatile organic solvent to the sludge is 1-2: 1.
Preferably, in the step (1), the extraction stirring time is 15-60 min.
Preferably, in the step (2), the pressure of the filter pressing dehydration is 0.1-0.6 MPa, and the filter pressing time is 15-30 min.
Preferably, in the step (3), the solvent is recovered from the filtrate by reduced pressure distillation, the operation temperature is 40-60 ℃, the vacuum degree is 0.04-0.08 MPa, and the condensation temperature of the solvent vapor is 10-20 ℃.
Preferably, in the step (3), the solvent is recovered from the mud cake obtained by solid-liquid separation through reduced pressure evaporation, the operation temperature is 40-60 ℃, the vacuum degree is 0.04-0.08 MPa, and the condensation temperature of the solvent vapor is 10-20 ℃.
Due to the adoption of the scheme, the invention has the beneficial effects that:
the treatment method is simple and easy to implement, does not need to consume a dehydration conditioner, does not need a sludge pretreatment process, can overcome the defects of large dosage of a traditional sludge dehydration-heat drying process medicament, high sludge capacity-increasing ratio, low dehydration efficiency, high drying energy consumption and the like, not only reduces the risk of secondary environmental pollution possibly generated by adding the sludge conditioner, but also can efficiently reduce the water content of the sludge; finally, the solvent recovery rate is more than 90%, and the water content of the mud cake is lower than 60%. In addition, after the sludge deep dehydration treatment process is completed, the distilled and recovered solvent can be recycled, and the dehydration material consumption and the process operation cost are both reduced, so that the treatment method has higher social environmental benefit, economic benefit and wide market application prospect.
Drawings
FIG. 1 is a schematic flow diagram of a conditioner circulation type sludge dewatering process according to an embodiment of the present invention.
Detailed Description
The invention provides a sludge deep dehydration treatment technical method for recycling a conditioner, which comprises the steps of mixing sludge with polar volatile organic solvents such as acetone, acetonitrile and methanol, stirring and extracting for a certain time, transferring polar water-holding substances in the sludge from a solid-liquid phase interface to an organic phase, further reducing the water-holding capacity of the sludge and improving the solid-liquid separation performance of the sludge; then, the solid-liquid separation of the sludge is carried out in a filter pressing mode, and the effective recovery of the solvent in the filtrate and the dehydrated mud cake is realized by respectively utilizing reduced pressure distillation and reduced pressure evaporation, so that the recycling of the solvent type sludge dehydration conditioner is completed while the solid content of the mud cake is remarkably improved.
The present invention will be further described with reference to the following examples.
Example 1 deep dehydration of sludge from a Sewage treatment plant in Shanghai City
(1) Mixing sludge with initial water content of 97.5% with acetonitrile at a mixing mass ratio of 1:1, and extracting and stirring for 15 min;
(2) performing solid-liquid separation by adopting a filter pressing mode, wherein the filter pressing pressure is 0.1MPa, and the filter pressing time is 15 min;
(3) distilling the filtrate under reduced pressure to recover solvent at 50 deg.C, vacuum degree of 0.04MPa, and condensation temperature of solvent vapor of 20 deg.C; and recovering the solvent from the mud cake obtained by solid-liquid separation by decompression evaporation, wherein the operation temperature is 50 ℃, the vacuum degree is 0.04MPa, and the condensation temperature of the solvent vapor is 20 ℃.
(4) The recovery rate of the solvent in the final mud cake is 87.0 percent, the recovery rate of the solvent in the filtrate is 93.2 percent, and the final water content of the mud cake after the solvent is recovered is 59.8 percent.
Example 2 deep dehydration of sludge from a Sewage treatment plant in Shanghai City
(1) Mixing sludge with initial water content of 97.5% with acetone at a mixing mass ratio of 2:1, and extracting and stirring for 30 min;
(2) performing solid-liquid separation by adopting a filter pressing mode, wherein the filter pressing pressure is 0.6MPa, and the filter pressing time is 30 min;
(3) recovering solvent from the filtrate by reduced pressure distillation, wherein the operating temperature is 40 ℃, the vacuum degree is 0.08MPa, and the condensation temperature of solvent vapor is 10 ℃; and recovering the solvent from the mud cake obtained by solid-liquid separation by reduced pressure evaporation, wherein the operation temperature is 40 ℃, the vacuum degree is 0.08MPa, and the condensation temperature of the solvent vapor is 10 ℃.
(4) The recovery rate of the solvent in the final mud cake is 90.3%, the recovery rate of the solvent in the filtrate is 98.1%, and the final water content of the mud cake after the solvent is recovered is 53.7%.
Example 3 deep dehydration of sludge from a Sewage treatment plant in Shanghai City
(1) Mixing sludge with initial water content of 97.5% with methanol at a mixing mass ratio of 1.5:1, extracting and stirring for 60 min;
(2) performing solid-liquid separation by adopting a filter pressing mode, wherein the filter pressing pressure is 0.3MPa, and the filter pressing time is 25 min;
(3) distilling the filtrate under reduced pressure to recover solvent at 45 deg.C, 0.06MPa and 15 deg.C; and recovering the solvent from the mud cake obtained by solid-liquid separation by reduced pressure evaporation, wherein the operation temperature is 45 ℃, the vacuum degree is 0.06MPa, and the condensation temperature of the solvent vapor is 15 ℃.
(4) The final cake had a solvent recovery of 87.2% and the filtrate a solvent recovery of 102.1% (this is because the total mass of the recovered solvent was higher than the mass of the added solvent due to evaporation of water also during the recovery process), and the final water content of the cake after solvent recovery was 52.7%.
Example 4 deep dehydration of sludge from a Sewage treatment plant in Shanghai City
(1) Mixing the sludge with initial water content of 95% with acetonitrile at a mixing mass ratio of 2:1, and extracting and stirring for 15 min;
(2) performing solid-liquid separation by adopting a filter pressing mode, wherein the filter pressing pressure is 0.5MPa, and the filter pressing time is 20 min;
(3) recovering solvent from the filtrate by reduced pressure distillation, wherein the operating temperature is 60 ℃, the vacuum degree is 0.08MPa, and the condensation temperature of solvent vapor is 10 ℃; and recovering the solvent from the mud cake obtained by solid-liquid separation by reduced pressure evaporation, wherein the operation temperature is 60 ℃, the vacuum degree is 0.08MPa, and the condensation temperature of the solvent vapor is 10 ℃.
(4) The recovery rate of the solvent in the final mud cake is 97.5%, the recovery rate of the solvent in the filtrate is 92.4%, and the final water content of the mud cake after the solvent is recovered is 55.5%.
Example 5 deep dehydration of sludge from a Sewage treatment plant in Shanghai City
(1) Mixing the sludge with initial water content of 99% with acetone at a mixing mass ratio of 0.25:1, and extracting and stirring for 30 min;
(2) performing solid-liquid separation by adopting a filter pressing mode, wherein the filter pressing pressure is 0.1MPa, and the filter pressing time is 20 min;
(3) distilling the filtrate under reduced pressure to recover solvent at 40 deg.C, vacuum degree of 0.05MPa, and condensation temperature of solvent vapor of 15 deg.C; and recovering the solvent from the mud cake obtained by solid-liquid separation by reduced pressure evaporation, wherein the operation temperature is 40 ℃, the vacuum degree is 0.05MPa, and the condensation temperature of the solvent vapor is 15 ℃.
(4) The recovery rate of the solvent in the final mud cake is 95.4%, the recovery rate of the solvent in the filtrate is 96.7%, and the final water content of the mud cake after the solvent is recovered is 66.1%.
Example 6 deep dehydration of sludge from certain Sewage treatment plant in Shanghai City
(1) Mixing sludge with initial water content of 95% with methanol at a mixing mass ratio of 0.25:1, extracting and stirring for 60 min;
(2) performing solid-liquid separation by adopting a filter pressing mode, wherein the filter pressing pressure is 0.6MPa, and the filter pressing time is 15 min;
(3) recovering solvent from the filtrate by reduced pressure distillation, wherein the operating temperature is 50 ℃, the vacuum degree is 0.07MPa, and the condensation temperature of solvent vapor is 10 ℃; and recovering the solvent from the mud cake obtained by solid-liquid separation by decompression evaporation, wherein the operation temperature is 50 ℃, the vacuum degree is 0.07MPa, and the condensation temperature of the solvent vapor is 10 ℃.
(4) The recovery rate of the solvent in the final mud cake is 98.2%, the recovery rate of the solvent in the filtrate is 98.7%, and the final water content of the mud cake after the solvent is recovered is 54.6%.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. It will be readily apparent to those skilled in the art that various modifications to these embodiments and the generic principles defined herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above-described embodiments. Those skilled in the art should appreciate that many modifications and variations are possible in light of the above teaching without departing from the scope of the invention.

Claims (9)

1. The deep dehydration treatment method of the sludge is characterized by comprising the following steps:
(1) mixing the sludge and a polar volatile organic solvent, stirring and extracting for reaction, so that polar water-holding substances in the sludge are transferred to an organic phase from a solid-liquid phase interface, and further reducing the water-holding capacity of the sludge and improving the solid-liquid separation performance of the sludge;
(2) performing solid-liquid separation on the sludge in a filter pressing mode;
(3) the effective recovery of the solvent in the filtrate and the dewatered mud cake is realized by respectively utilizing reduced pressure distillation and reduced pressure evaporation, so that the recycling of the solvent type sludge dewatering conditioner is completed while the solid content of the mud cake is remarkably improved.
2. The method for deep sludge dewatering treatment according to claim 1, characterized in that: in the step (1), the sludge is excess sludge of a sewage treatment plant.
3. The method for deep sludge dewatering treatment according to claim 1, characterized in that: in the step (1), the water content of the sludge is 95-99%.
4. The method for deep sludge dewatering treatment according to claim 1, characterized in that: in the step (1), the polar volatile organic solvent is acetonitrile, acetone or methanol.
5. The method for deep sludge dewatering treatment according to claim 1, characterized in that: in the step (1), the mixing mass ratio of the polar volatile organic solvent to the sludge is (0.25-2): 1.
6. The method for deep sludge dewatering treatment according to claim 1, characterized in that: in the step (1), the extraction stirring time is 15-60 min.
7. The method for deep sludge dewatering treatment according to claim 1, characterized in that: in the step (2), the pressure of filter pressing dehydration is 0.1-0.6 MPa, and the filter pressing time is 15-30 min.
8. The method for deep sludge dewatering treatment according to claim 1, characterized in that: in the step (3), the solvent is recovered from the filtrate by reduced pressure distillation, the operation temperature is 40-60 ℃, the vacuum degree is 0.04-0.08 MPa, and the condensation temperature of the solvent vapor is 10-20 ℃.
9. The method for deep sludge dewatering treatment according to claim 1, characterized in that: in the step (3), the solvent is recovered from the mud cake obtained by solid-liquid separation through reduced pressure evaporation, the operation temperature is 40-60 ℃, the vacuum degree is 0.04-0.08 MPa, and the condensation temperature of the solvent vapor is 10-20 ℃.
CN202010661533.XA 2020-07-10 2020-07-10 Sludge deep dehydration treatment technical method for recycling conditioner Pending CN111732322A (en)

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Citations (10)

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CN101780390A (en) * 2009-01-16 2010-07-21 中国科学院过程工程研究所 Substitution and dehydration method for water contained solid materials and device
CN102050556A (en) * 2009-10-30 2011-05-11 中国石油天然气股份有限公司 Treatment method of oily sludge
CN102276097A (en) * 2011-06-16 2011-12-14 浙江大洋化工股份有限公司 Processing method of high density organic process wastewater in production of amprolium hydrochloride
CN102603025A (en) * 2012-03-31 2012-07-25 中国中化股份有限公司 Method for processing wastewater produced in reactive dye production by utilizing complexing extraction technology
CN103964531A (en) * 2014-05-19 2014-08-06 西南大学 Reverse micelle dye extraction and recycling method for textile dyeing waste water
CN104478028A (en) * 2014-12-11 2015-04-01 沈阳化工研究院有限公司 Treatment method of saccharin production wastewater
CN107399781A (en) * 2017-08-18 2017-11-28 新疆如意纺织服装有限公司 Reactive dyeing raffinate recovery system and recovery method
CN207108772U (en) * 2017-08-18 2018-03-16 长沙加中环保科技有限公司 A kind of sludge treating system
CN111348761A (en) * 2018-12-20 2020-06-30 北京惠宇乐邦环保科技有限公司 Treatment method and treatment device for coke quenching wastewater

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101780390A (en) * 2009-01-16 2010-07-21 中国科学院过程工程研究所 Substitution and dehydration method for water contained solid materials and device
CN101497942A (en) * 2009-03-11 2009-08-05 南京农业大学 Biological leaching-solvent extraction-electrodeposition recovering method for heavy metal copper in sludge
CN102050556A (en) * 2009-10-30 2011-05-11 中国石油天然气股份有限公司 Treatment method of oily sludge
CN102276097A (en) * 2011-06-16 2011-12-14 浙江大洋化工股份有限公司 Processing method of high density organic process wastewater in production of amprolium hydrochloride
CN102603025A (en) * 2012-03-31 2012-07-25 中国中化股份有限公司 Method for processing wastewater produced in reactive dye production by utilizing complexing extraction technology
CN103964531A (en) * 2014-05-19 2014-08-06 西南大学 Reverse micelle dye extraction and recycling method for textile dyeing waste water
CN104478028A (en) * 2014-12-11 2015-04-01 沈阳化工研究院有限公司 Treatment method of saccharin production wastewater
CN107399781A (en) * 2017-08-18 2017-11-28 新疆如意纺织服装有限公司 Reactive dyeing raffinate recovery system and recovery method
CN207108772U (en) * 2017-08-18 2018-03-16 长沙加中环保科技有限公司 A kind of sludge treating system
CN111348761A (en) * 2018-12-20 2020-06-30 北京惠宇乐邦环保科技有限公司 Treatment method and treatment device for coke quenching wastewater

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